[PCB_FORUM] Re: thermal flash for a slot padstack
- From: "Macindoe, Gary" <Gary.Macindoe@xxxxxxx>
- To: icu-pcb-forum@xxxxxxxxxxxxx
- Date: Tue, 15 Jan 2008 09:52:28 -0600
Hey Jim,
Wow, that's a lot to create a thermal flash!
I solved my flash creation for now, I was just wondering if the
automatic way worked for a slot.
What I did was to create two circular thermal shapes (in a "Flash"
drawing, Add -> Flash):
Then I deleted the two inner shapes and merged the two shapes on each
side to get this:
Maybe Add -> Flash will someday work for slots automatically.
Thanks for your reply!
Gary
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Jim Wages
Sent: Monday, January 14, 2008 4:51 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] Re: thermal flash for a slot padstack
Gary,
I've never heard of, or needed to create a slotted, thermally relieved
padstack before, and from my brief check, I don't see a way to build it
using the "Flash" approach.
I can think of a few different approaches to thermally relieving slot
shaped footprint pin soldered connections, but it would really depend on
your specific needs.
I assume this is a plated slot connection to be soldered to a component
footprint pin.
Also assuming you need connection to and therefore, thermal relief from,
an inner layer power/gnd plane.
You require consistent repeatability?
If I had a single layout that required a large number of connections
with these types of parameters, I would probably create the footprint
symbol with the (manually created) thermally relieved, etch layer
specific, shapes built into it. You would have to fiddle with the net
assignment and merging process a bit, but that could be resolved pretty
easily with scripts. I think this approach would also require you to use
dynamic and perhaps even positive plane layers.
I can see a lot of advantage to having a "flash" solution over my
suggestion.
Good luck
Jim
________________________________
From: icu-pcb-forum-bounce@xxxxxxxxxxxxx
[mailto:icu-pcb-forum-bounce@xxxxxxxxxxxxx] On Behalf Of Macindoe, Gary
Sent: Monday, January 14, 2008 6:07 PM
To: icu-pcb-forum@xxxxxxxxxxxxx
Subject: [PCB_FORUM] thermal flash for a slot padstack
Hey guys,
Ok, I'm trying to create a thermal flash symbol for a slot.
I'm in a drawing with the symbol Type set to "Flash".
I go Add -> Flash, and in the Thermal Pad Symbol Defaults window, It
appears that I can only add the thermal shapes for a circle.
Is there any way to automatically create the shapes for a slotted
thermal?
I believe I can create two thermals for circles, then merge them to
create a slotted thermal. Is that the only way?
Thanks for any help!
Gary E. MacIndoe
PCB Design Engineer
Fort Collins, Colorado
amd.com
gary.macindoe@xxxxxxx
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